"Over the past five years (2009-2013), retailer
gross margins (before expenses) have
averaged 17.1 cents per gallon. Expenses to
sell that fuel range from about 12 to 16 cents
per gallon, so any change in the gross margin
has a significant effect on profit margins. "
15-20% is not accurate. That is getting into the 40-50 cents per gallon range after costs.
This gives a lot of insight into gas and oil pricing.
http://www.nacsonline.com/YourBusine...eport_full.pdf